Miami Metro heroine Debra Morgan and newly-minted murderess Hannah McKay have yet to cross paths on Showtime’s Dexter (Sundays, 9/8c), but an intro between the two is imminent and — according to Jennifer Carpenter– it’s not gonna be pretty.

“The interaction between Deb and Hannah is like putting two Siamese fighting fish in a bowl, where one will ultimately destroy the other,” the actress tells TVLine with a laugh.”You just don’t know who is going to win.”

Carpenter reveals that “their tension is palpable” from the get-go for a number of reasons, including “the rap sheet that Hannah comes with, [and] the threat she poses to both Deb’s brother [Dexter] and to Deb herself.” Adds the actress, “Hannah’s such a different flavor than Deb; still just as strong and potent, but she has a different fighting style… She’s working all kinds of angles, and there’s every reason [for Deb] to get her out of [their] lives.”